TRANSFORMATION OF A UNIT PUMP EQUIPPED SINGLE CYLINDER DIESEL ENGINE TO A PLC CONTROLLED HIGH PRESSURE FUEL INJECTED RESEARCH ENGINE

Abstract

In diesel engines, combustion efficiency depends on the mixture formation. At this point, injection system has an important role on mixture formation. In alternative fuel studies, the injection system parameters like pressure, injection advance, and injection character must be controllable. In general, single cylinder diesel test engines have mechanical unit pump systems and this system have no changeable parameters. From this point of view, the mechanic injector must be change with an electromagnetic injector to control the injection parameters. For this reason, a programmable logic controller was chosen to control injector. Before the adaptation, performance and emission (CO, CO2, HC, O-2, NOx and lambda) test were done with mechanical system. After along research and development period, a single cylinder Lombardini LDA 450 type diesel engine was modified to a high pressured (600-1600 bar), plc controlled engine.